The Fab Five
Robert "Bobby" Drake was created in 1963 and is one of the founding five members of the X-Men. He has appeared regularly over the last fifty years in multiple incarnations of the X-Men comic books and in other teams like X-Factor, The Defenders, and The Champions. The character has also made appearances in cartoons and movie adaptations.
Stan Lee and Jack Kirby initially created Iceman using the Human Torch as the template, except giving him the "opposite" power. In the early books, Iceman had the appearance of a snowman in boots, and only later changed into the more crystal clear version more commonly known today. He also underwent a "secondary mutation" that for a time had him stuck in his ice form.
Bobby is an honest, forthright and sometimes cocky character, his status as the youngest of the original X-Men giving him certain allowances for his brash behavior, although he remained that way as he got older.
Throughout his comic book life, Iceman has enjoyed relationships with female characters like Kitty Pryde, Opal Tanaka, Mystique, and Lorna Dane, however, it was revealed in a more recent story that he was in fact gay.
Due to some time-travel shenanigans, a younger version of Iceman was present in the future and it was there that his telepathic teammate Jean Grey discovered that the younger Bobby was gay.
Iceman in the movies
One of the disappointments of the movie incarnations of the X-men is that the original five: Cyclops, Jean Grey, Beast, Angel and Iceman, while all appearing in the same movie, have not actually all been part of the same line-up. The closest we've come to seeing the original line-up together was in X-men 3: The Last Stand, where all five characters were in the movie, although they never appear together in the same team.
X-Men: Apocalypse is due out on May 27th and although it looks like they recast a younger Cyclops and Jean Grey, and added an all-new Angel/Archangel to star alongside the returning Nicholas Hoult as Beast, there's been no word on Iceman making a return.